Mitsubishi Electric 800 Series Instruction Manual (Function page 278

Pr. Name
9
Electronic thermal O/L relay
H000
600 First free thermal reduction
H001 frequency 1
601 First free thermal reduction
H002 ratio 1
602 First free thermal reduction
H003 frequency 2
603 First free thermal reduction
H004 ratio 2
604 First free thermal reduction
H005 frequency 3
607
Motor permissible load level
H006
51 Second electronic thermal O/L
H010 relay
692 Second free thermal reduction
H011 frequency 1
693 Second free thermal reduction
H012 ratio 1
694 Second free thermal reduction
H013 frequency 2
695 Second free thermal reduction
H014 ratio 2
696 Second free thermal reduction
H015 frequency 3
608 Second motor permissible load
H016 level
561
PTC thermistor protection level 9999
H020
1016 PTC thermistor protection
H021 detection time
*1 The initial value for the FR-E820-0050(0.75K) or lower, FR-E840-0026(0.75K) or lower, FR-E860-0017(0.75K), and FR-E820S-0050(0.75K) or
lower is set to the 85% of the inverter rated current.
 Electronic thermal O/L relay operation characteristic for induction motor
(Pr.9)
• This function detects the overload (overheat) of the motor and shut off the inverter output by stopping the operation of the
transistor at the inverter output side.
• Set the rated current (A) of the motor in Pr.9 Electronic thermal O/L relay. (If the motor has both 50 Hz and 60 Hz ratings
and the Pr.3 Base frequency is set to 60 Hz, set to 1.1 times the 60 Hz rated motor current.)
• Set "0" in Pr.9 to avoid activating the electronic thermal relay function; for example, when using an external thermal relay
for the motor.
(Note that the output transistor protection of the inverter is activated. (E.THT))
Initial value Setting range
Inverter rated
0 to 500 A
*1
current
0 to 590 Hz
9999
9999
1% to 100%
100%
9999
0 to 590 Hz
9999
9999
1% to 100%
100%
9999
0 to 590 Hz
9999
9999
150% 110% to 250%
0 to 500 A
9999
9999
0 to 590 Hz
9999
9999
1% to 100%
100%
9999
0 to 590 Hz
9999
9999
1% to 100%
100%
9999
0 to 590 Hz
9999
9999
110% to 250%
9999
9999
0.5 to 30 kΩ
9999
0 s 0 to 60 s
12.1 Motor overheat protection (electronic thermal O/L relay)
Description
Set the rated motor current.
The electronic thermal O/L relay operation level can
be changed to match the motor temperature
characteristics with the combination of these three
points (Pr.600, Pr.601), (Pr.602, Pr.603), (Pr.604,
Pr.9).
9999: Free thermal O/L relay invalid
Set the permissible load according to the motor
characteristics.
Enabled when the RT signal is ON.
Set the rated motor current.
Second electronic thermal O/L relay invalid
The electronic thermal O/L relay operation level can
be changed to match the motor temperature
characteristics with the combination of these three
points (Pr.692, Pr.693), (Pr.694, Pr.695), (Pr.696,
Pr.51) when the RT signal is ON.
9999: Second free thermal O/L relay invalid
Set the permissible frequency when the RT signal is
ON.
The Pr.607 setting is applied even when the RT signal
is ON.
Set the PTC thermistor protection level (resistance).
PTC thermistor protection disabled
Set the time from when the resistance of the PTC
thermistor reaches the protection level until the
protective function is activated.
12. (H) Protective Function Parameters
11
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